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Land Use/Land Cover Change Detection

GIS in Health and Planning2012 SpringRutgers Universityby Wansoo Im, Ph.D.

DOWNLOAD MUNICIPAL BOUNDARYHTTP://NJGIN.STATE.NJ.US

DOWNLAOD -> DON’T FORGET TO EXTRACT FILES!

WATERSHED DATA DOWNLOADWWW.STATE.NJ.US/DEP/GIS

SELECT YEAR OF DATA->CLICK “CONTINUE”

CHECK THE LOCATION MAP OF WATERSHED BEFORE DOWNLOADING THE FILE- What is watershed?

DOWNLOAD THE SHAPEFILE

DON’T FORGET TO EXTRACT FILES AGAIN.

ADD MUNICIPAL BOUNDARY AND WATERSHED SHAPEFILES

OPEN THE ATTRIBUTE TABLE OF LAND USE (WATERSHED) LAYER-Change the color of municipality layer to “No

color(Transparent)”

- Change the color of Municipality boundary to distinguish that of a watershed layer, for example, to “red color”

CHECK IF THE FIELD CONSISTS OF NOMINAL VARIABLES OR NOT(ORDINAL/NUMERIC?...)

(ex) Field Type02 -> Urban/Forest… -> Nominal variable)-> Maps by Categories

CLICK THE FIELD YOU WANT TO MAP

CLICK “ADD ALL VALUES”

COLOR ARRANGEMENT FOR LAND USE

http://www.metrogis.org/data/info_needs/existing_land_use/codescheme.pdf

LAND USE COLOR PALLETE (LBCS STANDARD)HTTP://WWW.PLANNING.ORG/LBCS/STANDARDS/

<EXTRACT THE SELECTED FEATURE>

OPEN ATTRIBUTE TABLE FROM A MUNICIPAL LAYER -> SELECT THE FEATURE

“NEW BRUNSWICK” IS SELECTED (HIGHLIGHTED BY BLUE COLOR OF BOUNDARY)

EXPORT THE SELECTED FEATURE

SAVE THE SELECTED FEATURE(EX)NEW BRUNSWICK) AS A SHAPEFILE.

NEWLY-CREATED “NEWBRUNS WICK LAYER(NB)”

CLIP

Geo processing->clip->set the right directory(a location where you want to save a file)

Cookie dough (input feature) : Watershed layer (Land Use layer)

Cookie cutter(Clip feature) : New Brunswick layer (the one you exported from municipal boundary layer)

(The data in attribute table which is contained in Watershed layer(Land Use layer) will be conveyed to the newly clipped layer after you clip watershed layer with New Brunswick layer)

CLIP

SELECT THE DIRECTORY (LOCATION WHERE YOU SAVE THE FILE)

INPUT FEATURE(WATERSHED LAYER)/OUTPUT FEATURE(NEW BRUNSWICK LAYER)AND CLICK “OK”

NEXT STEP : NEW BRUNSWICK LAND USE CHANGE1. Export Land Use Layer(watershed layer) with the boundary of

New brunswick boundary layer from municipal boundary layer by “Clip tool”

2. Within clipped-New Brunswick Land use layer(watershed layer), select the land use change area (Field Name : CHANGE07) by using “Select by attribute “

Fomulas : “CHANGE07”=1

Right click on the layer of NB land use and export the feature as a shapefile while selection on the land use change is activated, then you will get the map of land use change in 2007 WITHIN New Brunswick.

3. In this exported map(Land Use Change07 within NB), we want to check how many residential areas are included.

Open Attribute table, and Sorting data by clicking the field of Land use by dragging individual cases in “the attribute table” – Use Sorting function in the attribute table –

4. Calculate the Acres of selected features : Open the attribute table –select the variables/cases/features that you want to calcuate – Right click on the ‘ACRES” field – Click “Statistics”

SELECT BY ATTRIBUTE

FIELD “CHANGE07” = 1Land use change occurred in 2007 : CHANGE07 = 1

No land use change in 2007 : CHANGE07=0

EXPORT THIS SELECTED LAND USE CHANGE AREAS

SELECT RESIDENTIAL AREA WITHIN LAND USE CHANGE FEATURES.Click the layer for land use change that you just exported-> Open attribute table -> sort -> drag (select the all residential area) -> export a data again.

SELECT RESIDENTIAL AREA IN THE ATTRIBUTE TABLE.

OUTCOME

CALCULATE ACRES :

1. Select the cases that you want to calculate

2. Right click Acres – go to “statistics”

3. Information available

- Counts (Number of cases you chose)

- Sum / Minimum/Maximum/Standard deviation/…

STATISTICS

EXAMPLE OF LAND USE CHANGE ANALYSIS

Land use change around Raritan river waterbody – related to contamination.

1. Clip certain area of interests

2. buffer the river

< Applications >

- Mapping Land use change within municipalities

- The impact of Municipal policies on Land use,

- The analysis of land preservation – its comparison with other municipalities and so on